US4583450A - Coffee machine - Google Patents

Coffee machine Download PDF

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Publication number
US4583450A
US4583450A US06/685,176 US68517684A US4583450A US 4583450 A US4583450 A US 4583450A US 68517684 A US68517684 A US 68517684A US 4583450 A US4583450 A US 4583450A
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US
United States
Prior art keywords
chamber
boiling
pressurised medium
water
coffee machine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/685,176
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English (en)
Inventor
Kurt Rost
Ueli Casty
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CAFAG AG
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CAFAG AG
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Filing date
Publication date
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Assigned to CAFAG AG reassignment CAFAG AG ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CASTY, UELI, ROST, KURT
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Publication of US4583450A publication Critical patent/US4583450A/en
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J31/00—Apparatus for making beverages
    • A47J31/24—Coffee-making apparatus in which hot water is passed through the filter under pressure, i.e. in which the coffee grounds are extracted under pressure
    • A47J31/34—Coffee-making apparatus in which hot water is passed through the filter under pressure, i.e. in which the coffee grounds are extracted under pressure with hot water under liquid pressure
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J31/00—Apparatus for making beverages
    • A47J31/24—Coffee-making apparatus in which hot water is passed through the filter under pressure, i.e. in which the coffee grounds are extracted under pressure
    • A47J31/34—Coffee-making apparatus in which hot water is passed through the filter under pressure, i.e. in which the coffee grounds are extracted under pressure with hot water under liquid pressure
    • A47J31/36—Coffee-making apparatus in which hot water is passed through the filter under pressure, i.e. in which the coffee grounds are extracted under pressure with hot water under liquid pressure with mechanical pressure-producing means

Definitions

  • the invention relates to a coffee machine comprising a boiling chamber, two pistons adjustable independently of each other and adapted to be pushed into the boiling chamber from opposite sides and defining between them a boiling space to hold and boil a predetermined quantity of powdered coffee, a source of boiling water with a through-flow heater and a boiling water pressure generator and a hydraulic actuating device for the pistons with a pressurised medium circuit comprising a pressurised medium pump.
  • An object of the invention is to provide a coffee machine of the type mentioned at the outset, which affords a keenly priced, space-saving and as far as possible maintenance-free arrangement for generating the boiling water pressure.
  • the boiling water pressure generator is constituted by a media converter, one side of which is incorporated into the water supply flow to the boiling chamber while its other side is adapted to be connected to the pressurised medium pump.
  • Such a media converter can be of extremely simple construction which means that it can be produced at a low price. In addition, it is virtually maintenance-free and operates over long periods of time without any breakdown. In the coffee machine, therefore, only one pump is required, namely the pressurised medium pump of the hydraulic operating means, which is provided in any case for the pistons of the boiling chamber and, if need be, for ejection of the extracted powdered coffee.
  • the media converter is disposed at a point along the water supply line which is upstream of the through-flow heater, so that it is only subject to the action of the cold inflowing water. This reduces the risk of calcification of the media converter if the water has a very high lime content.
  • the media converter it is not absolutely necessary for the media converter to consist of materials suitable for temperatures close to the boiling point of water.
  • the media converter consists of a container with a water chamber and a chamber to hold pressurised medium, the chambers being separated from each other by a pressure-transmitting element.
  • the pressure transmitting element is a resilient diaphragm.
  • the media converter is so constructed that at least the part of the container wall which defines the pressurised medium chamber tapers towards the aperture provided for inlet of pressurised medium, the diaphragm being so shaped that when the pressurised medium chamber is in a pressureless state, it bears on its inside face.
  • the effective pressure area increases progressively until, in the end, it corresponds to the entire area of the diaphragm which is subject to the action of the pressurised medium. Consequently, the boiling water does not enter the boiling chamber abruptly at the maximum possible pressure but at a gradually increasing pressure. It has been demonstrated that the quality of the coffee brewed can be achieved if the pressure of the boiling water rises gradually. A corresponding control of a boiling water pump would necessitate an unevenly greater cost.
  • the container consists of two hemispherical shells between which the diaphragm is clamped.
  • the pressurised medium pump disposed in the pressurised medium tank of the pressurised medium circuit are the pressurised medium pump and a heat exchanger through which passes the water supplying to the through-flow heater.
  • the pressurised medium pump or pressurised medium will be cooled while on the other the water flowing to the through-flow heater will be pre-heated. Consequently, it is possible to achieve a not inconsiderable saving on energy.
  • FIG. 1 is a diagrammatic representation of the pressurised medium circuit and shows the flow of boiling water in the coffee machine according to the invention
  • FIG. 2 is a detailed circuit diagram of the hydraulic actuating means in the coffee machine according to the invention.
  • FIG. 3 is a cross-section through a media converter according to the invention.
  • reference numeral 10 generally denotes an automatic piston device of a coffee machine such as is described for example in Swiss Patent Specification No. 641 030.
  • This automatic piston device is indicated in FIG. 2 in a very simplified view. It comprises a cylindrical boiling chamber 12 into the oppositely disposed axial ends of which it is possible to insert in each case a piston 14, 16, these pistons 14 and 16 being adjustable independently of each other by a working cylinder 18, 20.
  • the piston 14 and the piston 16 enclose between them a boiling space into which the piston 14 introduces the boiling water and out of which the piston 16 discharges the coffee.
  • FIG. 2 also shows another working cylinder which actuates a pivot arm, not shown, which withdraws from the boiling chamber and feeds to a waste container the coffee filling which has been pressed into a tablet and exhausted. All these functions are described in detail in Swiss Patent Specification No. 641 030 so that they do not need to be explained in greater detail here. All three working cylinders 18, 20 and 22 are adapted to be connected to the pressure side of a pressurised medium pump 30 or pressurised medium tank 32 in each case via a separably operable multi-way valve 24, 26 and 28.
  • the pressurised medium pump 30 is disposed inside the pressurised medium tank 32 and is driven by an electric motor 34.
  • the valve assembly which comprises the valves 24 to 28 also contains a further optionally operable multi-way valve 36 through which the pressure side of the pump 30 can be connected to the pressurised medium side 38 of a spherical media converter 40.
  • This media converter consists according to FIG. 3 of two hemispherical shells 42 and 44 of which the encircling radial flanges 46, 48 are bolted to each other and between which there is stretched a resilient diaphragm 50 which, in the unladen state, bears against the inside face of the hemispherical shell 42 defining the pressurised medium chamber, as is shown in FIG. 3.
  • the hemispherical shell 42 of the media converter 40 has a pressurised medium inlet 52 which is connected to the multi-way valve 36 through a line 54 and a pressure reducing valve 56 which is intended for adjustment of the boiling pressure.
  • the water chamber of the media converter 40 which is bounded by the diaphragm 50 and the hemispherical shell 44 of the media converter, is connected by a throughflow passage 58 to a portion 60 of the line leading from the water mains to the boiling chamber 12, this portion being located between two non-return valves 62 and 64 which are connected in the same sense so that when the boiling pressure is generated, the non-return valve 64 is closed in the direction of the mains while the non-return valve 62 is opened in the direction of the boiling chamber 12.
  • FIG. 1 shows, the boiling water flows through and is pre-heated in a heat exchanger 66 which is disposed in the pressurised medium tank 32.
  • the boiling water flows through a volume counter 68 before entering a throw-flow heater 70 from which it flows to a multi-way valve 72. From here, the boiling water passes through a restriction or orifice plate 74 to determine the throughflow resistance in the automatic piston device 10.
  • the throughflow heater 70 is connected to a discharge 78 via a pressure limiting valve 76.
  • the multi-way valve 72 permits of a connection between the automatic piston device 10 and the discharge 78 when the residual humidity is forced out of the exhausted powdered coffee so that it can be ejected into the waste container with the lowest possible moisture content.
  • FIG. 1 shows a container 8 for a cleaning agent with which the automatic piston device 10 can be cleaned at certain intervals.
  • the coffee machine according to the invention in order to prepare coffee, then first of all in per se known manner a specific quantity of coffee is ground and placed in the brewing chamber.
  • the piston 14 supplies boiling water.
  • the valve 36 is opened so the pressurised medium flows through the pressurised medium inlet 52 into the pressurised medium chamber of the media converter 40.
  • FIG. 3 shows, initially all that acts on the diaphragm 50 is a force corresponding to the cross-section of the pressurised medium inlet 52 at the diaphragm 50.
  • the solution according to the invention is less expensive to manufacture, more economical in operation and requires less maintenance than the conventional solutions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Apparatus For Making Beverages (AREA)
  • Tea And Coffee (AREA)
US06/685,176 1984-10-11 1984-12-21 Coffee machine Expired - Fee Related US4583450A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH487384 1984-10-11
CH4873/84 1984-10-11

Publications (1)

Publication Number Publication Date
US4583450A true US4583450A (en) 1986-04-22

Family

ID=4284039

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/685,176 Expired - Fee Related US4583450A (en) 1984-10-11 1984-12-21 Coffee machine

Country Status (6)

Country Link
US (1) US4583450A (ko)
EP (1) EP0177636B1 (ko)
JP (1) JPS6190620A (ko)
KR (1) KR920005886B1 (ko)
AT (1) ATE57823T1 (ko)
DE (1) DE3483532D1 (ko)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5230277A (en) * 1991-01-25 1993-07-27 Ricerca Elettromeccanica S.R.L. Device for making coffee
US20050131392A1 (en) * 2001-03-09 2005-06-16 Scimed Life Systems, Inc. Systems, methods and devices relating to delivery of medical implants
US20080041232A1 (en) * 2006-08-21 2008-02-21 Yuen Kin Fai Hydraulic sealing assembly for a beverage machine brewing head
US20080139877A1 (en) * 2001-03-09 2008-06-12 Boston Scientific Scimed, Inc. Systems, methods and devices relating to delivery of medical implants
US20150216355A1 (en) * 2012-08-16 2015-08-06 Gideon Duvall Device and system for brewing infused beverages
US10117733B2 (en) 2001-03-09 2018-11-06 Boston Scientific Scimed, Inc. Systems, methods and devices relating to delivery of medical implants

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH673211A5 (en) * 1987-11-18 1990-02-28 Sintra Holding Ag Electric coffee machine with expresso coffee facility - has through-flow water heater and hot water boiler providing respective feeds

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3103873A (en) * 1959-12-31 1963-09-17 Seeburg Corp High-speed beverage brewer
US3478671A (en) * 1968-06-28 1969-11-18 Westinghouse Electric Corp Timing arrangement for an air operated coffee brewer
US3485162A (en) * 1968-04-01 1969-12-23 Universal Oil Prod Co Beverage preparation and dispensing apparatus
US4188863A (en) * 1977-10-28 1980-02-19 Lucio Grossi Automatic machine for the production of coffee from roasted coffee beans

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1395609A (fr) * 1963-12-24 1965-04-16 Procédé d'alimentation des machines à café <express> en eau potable sous pression et dispositif correspondant
CH553566A (de) * 1972-06-19 1974-09-13 Hgz Ag Maschine zum zubereiten eines getraenkes, insbesondere eines kaffeegetraenkes.
CH559028A5 (ko) * 1973-03-26 1975-02-28 Olympia Express
AT368859B (de) * 1977-04-27 1982-11-25 Puhr Walter Vorrichtung zur zubereitung und abgabe von heissgetraenken, insbesondere kaffee, tee oder aehnlichen aufgussgetraenken
CH641030A5 (de) * 1980-10-03 1984-02-15 Rost Kurt Verfahren zur herstellung von kaffee und kaffeemaschine zur ausfuehrung desselben.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3103873A (en) * 1959-12-31 1963-09-17 Seeburg Corp High-speed beverage brewer
US3485162A (en) * 1968-04-01 1969-12-23 Universal Oil Prod Co Beverage preparation and dispensing apparatus
US3478671A (en) * 1968-06-28 1969-11-18 Westinghouse Electric Corp Timing arrangement for an air operated coffee brewer
US4188863A (en) * 1977-10-28 1980-02-19 Lucio Grossi Automatic machine for the production of coffee from roasted coffee beans

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5230277A (en) * 1991-01-25 1993-07-27 Ricerca Elettromeccanica S.R.L. Device for making coffee
US20050131392A1 (en) * 2001-03-09 2005-06-16 Scimed Life Systems, Inc. Systems, methods and devices relating to delivery of medical implants
US20080139877A1 (en) * 2001-03-09 2008-06-12 Boston Scientific Scimed, Inc. Systems, methods and devices relating to delivery of medical implants
US8602965B2 (en) 2001-03-09 2013-12-10 Boston Scientific Scimed, Inc. System, methods and devices relating to delivery of medical implants
US10117733B2 (en) 2001-03-09 2018-11-06 Boston Scientific Scimed, Inc. Systems, methods and devices relating to delivery of medical implants
US20080041232A1 (en) * 2006-08-21 2008-02-21 Yuen Kin Fai Hydraulic sealing assembly for a beverage machine brewing head
US7784396B2 (en) 2006-08-21 2010-08-31 Electrical And Electronics Limited Hydraulic sealing assembly for a beverage machine brewing head
US20150216355A1 (en) * 2012-08-16 2015-08-06 Gideon Duvall Device and system for brewing infused beverages
US9867491B2 (en) * 2012-08-16 2018-01-16 Gideon Duvall Device and system for brewing infused beverages
US10258187B2 (en) * 2012-08-16 2019-04-16 Gideon Duvall Device and system for brewing infused beverages

Also Published As

Publication number Publication date
JPS6190620A (ja) 1986-05-08
EP0177636A2 (de) 1986-04-16
KR860002996A (ko) 1986-05-19
DE3483532D1 (de) 1990-12-06
JPH0516853B2 (ko) 1993-03-05
KR920005886B1 (ko) 1992-07-24
EP0177636A3 (en) 1986-07-02
EP0177636B1 (de) 1990-10-31
ATE57823T1 (de) 1990-11-15

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Owner name: CAFAG AG CH-6210 SURSEE SWITZERLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:ROST, KURT;CASTY, UELI;REEL/FRAME:004350/0549

Effective date: 19841203

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Year of fee payment: 4

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FP Lapsed due to failure to pay maintenance fee

Effective date: 19940705

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362